A Silicon-on-Insulator Slab for Topological Valley Transport
| Autor: | Fuli Zhao, Hao-Yang Qiu, Jian-Wen Dong, Xiao Dong Chen, Xin-Tao He, En-Tao Liang, Jia-Jun Yuan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Science Nanophotonics FOS: Physical sciences General Physics and Astronomy Silicon on insulator Physics::Optics 02 engineering and technology Topology Article General Biochemistry Genetics and Molecular Biology 03 medical and health sciences Robustness (computer science) lcsh:Science Photonic crystal Physics Multidisciplinary Silicon photonics business.industry Metamaterial General Chemistry Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology 030104 developmental biology lcsh:Q Berry connection and curvature Photonics 0210 nano-technology business Optics (physics.optics) Physics - Optics |
| Zdroj: | Nature Communications, Vol 10, Iss 1, Pp 1-9 (2019) Nature Communications |
| Popis: | Silicon-on-insulator (SOI) enables for capability improvement of modern information processing systems by replacing some of their electrical counterparts. With the miniaturization of SOI platform, backscattering suppression is one of the central issues to avoid energy loss and signal distortion in telecommunications. Valley, a new degree of freedom, provides an intriguing way for topologically robust information transfer and unidirectional flow of light, in particular for subwavelength strategy that still remains challenge in topological nanophotonics. Here, we realize topological transport in a SOI valley photonic crystal (VPC) slab. In such inversion asymmetry slab, singular Berry curvature near Brillouin zone corners guarantees valley-dependent topological edge states below light cone, maintaining a balance between in-plane robustness and out-of-plane radiation. Topologically robust transport at telecommunication wavelength is observed along two sharp-bend VPC interfaces with a compact size (< 10 um), showing flat-top high transmission of around 10% bandwidth. Furthermore, topological photonic routing is achieved in a bearded-stack VPC interface, originating from broadband unidirectional excitation of the valley-chirality-locked edge state by using a microdisk as a phase vortex generator. Control of valley in SOI platform not only shows a prototype of integrated photonic devices with promising applications for delay line, routing, optical isolation and dense wavelength division multiplexing for information processing based on topological nanophotonics, but also opens a new door towards the observation of non-trivial states even in non-Hermitain systems. 20 pages, 4 figures |
| Databáze: | OpenAIRE |
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